Differential Power Analysis (DPA) is a kind of side channel attack that makes use of statistically analyzed power consumption records to find out secret cryptographic information. Many types Hardware and Software level countermeasure has been propose

可以用来计算差分方程，以及计算波导模式，并在曲面上作图。-It can be used to calculate the differential equation, and the calculation of waveguide mode, and plotted on the surface.

有限单元法求解二阶偏微分方程，使用的方法是加权余量法，比一阶方程更加可靠-Finite element method for second order partial differential equations, a method using a weighted residual method is more reliable than the first-order equation